Agas contained within a piston-cylinder assembly, initially at a volume of 0.1 m3 , undergoes a constant-pressure expansion at 2 bars to a final volume of 0.12 m3 , while being slowly heated through the base. the change in internal change of the gas 0.25 kj. the piston and cylinder walls are fabricated from heat-resistant material and the piston moves smoothly in the cylinder. for the gas as the system, evaluate work and heat transfer each in kj (neglect the potential energy change and kinetic energy change).

Work: 4.0 kJ, heat: 4.25 kJ

Explanation:

For a gas transformation at constant pressure, the work done by the gas is given by

where in this case we have:

is the pressure

is the initial volume

is the final volume

Substituting,

The 1st law of thermodynamics also states that

where

is the change in internal energy of the gas

Q is the heat absorbed by the gas

Here we know that

Therefore we can re-arrange the equation to find the heat absorbed by the gas:

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explanation:

c) up is the direction the magnetic force is acting on the charge.